lib: mgmtd: only clear pending for the in-progress command

lib: mgmtd: only clear pending for the in-progress command

The lock/unlocks are being done short-circuit so they are never pending;
however, the handling of the unlock notification was always resuming the command
if pending was set. In all cases pending is set for another command. For example
implicit commit locks then when notified its done unlocks which was clearing the
set-config pending flag and resuming that command incorrectly.

Signed-off-by: Christian Hopps <chopps@labn.net>